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    static int getMaxStrLen(String s) {
        Set<Character> chars = new HashSet<> ();
        char[] cArray = s.toCharArray();
        for (char c : cArray) {
            if (!chars.contains(c)) {
                chars.add(c);
            }
        }
        if (chars.size() < 2)
            return 0;

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public static void main(String[] args) {
	Scanner in = new Scanner(System.in);
	int q = in.nextInt();
	for(int a0 = 0; a0 < q; a0++) {
		String s = in.next();
		boolean valid = false;
		long firstx = -1;
		// Try each possible starting number
		for (int i=1; i<=s.length()/2; ++i) {
			long x = Long.parseLong(s.substring(0,i));

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func somewhereElse() {
  let startLocation  = CLLocation(latitude: startLat, longitude: startLon)
  let endLocation = CLLocation(latitude: endLat, longitude: endLon)
  let locations = [startLocation,endLocation]
  var coordinates = locations.map({(location: CLLocation!) -> CLLocationCoordinate2D in return location.coordinate})
  let polyline = MKPolyline(coordinates: &coordinates, count: locations.count)
        mapView.add(polyline)
}
    
    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {

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System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

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class PaginateListings {

    static class Listing {
        Float score;
        String hostId;
        String listing;
        Listing(float s, String h, String l) {
            score = s;
            hostId = h;
            listing = l;